Carrier 38CKW - Page 9

Fig. 8—Typical 24-v Circuit Connections (Continued)
LEGEND
24 VOLT FACTORY WIRING
24 VOLT FIELD WIRING
FIELD SPLICE CONNECTION
CONTACTOR


C
NOTES:
1. CARRIER THERMOSTAT WIRING DIAGRAMS ARE ONLY ACCURATE FOR MODEL NUMBERS BEGINNING WITH
TSTAT_______.
2. WIRING MUST CONFORM TO NEC OR LOCAL CODES.
3. SOME UNITS ARE EQUIPPED WITH PRESSURE SWITCH(ES), TEMPERATURE SWITCH, OR 5-MINUTE COMPRESSOR
CYCLE PROTECTION. CONNECT 24-V FIELD WIRING TO FACTORY-PROVIDED STRIPPED LEADS.
4. THERMOSTATS ARE FACTORY CONFIGURED WITH 5-MINUTE COMPRESSOR CYCLE PROTECTION AND 4 CYCLES
PER HOUR LIMIT. SEE THERMOSTAT INSTALLATION INSTRUCTIONS FOR DETAILS.
5. TO STAGE ELECTRIC RESISTANCE HEAT, CONSULT OUTDOOR THERMOSTAT INSTALLATION INSTRUCTIONS.
A97365
24 VAC HOT






R
W
Y
G
R
DH
W1
W2
Y/Y2
OTHER
NON-PROGRAMMABLE
AC THERMOSTAT

FK4C
FAN COIL
AIR
CONDITIONER

C
INDOOR FAN


HEAT STAGE 1


COOL STAGE 1

Y1
C
SEE 
NOTE 2

G
O
J1 JUMPER
J2
JUMPER
A97471
24 VAC HOT






R
C
W/W1
Y/Y2
G
R
DH
W2
W1
Y/Y2
CARRIER
NON-PROGRAMMABLE
THERMOSTAT
MODEL AC
FK4C
FAN COIL
AIR
CONDITIONER

C
INDOOR FAN


HEAT STAGE 1


COOL STAGE 1
24 VAC COM
Y1
C
SEE 
NOTE 2
G
O
J2 JUMPER
J1 JUMPER
24 VAC HOT






R
G
W/W1
Y/Y2
O/W2
R
DH
W1
W2
Y/Y2
C
B
S1
S2
CARRIER
PROGRAMMABLE
THERMOSTAT
MODEL AC
FK4C
FAN COIL
AIR
CONDITIONER

G
Y1/W2
L
INDOOR FAN


HEAT STAGE 1


COOL STAGE 1
NOT USED
24 VAC COM
NOT USED

NOT USED

NOT USED

OPTIONAL
OUTDOOR
SENSOR
CONNECTION
C
Y1
O
C
SEE 
NOTE 2
J2 JUMPER
J1 JUMPER
A97472
A97368
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